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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '697484c9d35a29cd57e3af0843d6b64fb22a7dfc0ab79a03e47af3c71d72af0f' 
  AND token = 'x6QWc8NOE6OSa8jy2bhMxTfTSWnQ+TXHLD91jy0MWCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}